Page 93 - 4637
P. 93
reamer below and a stabilizer above the square collar are used. For
effective use the formation must be firm enough to provide support
for the assembly.
Figure 7.1 – Drill stem components
Drill pipe and tool joint
An entire chapter could be devoted to this subject. Drill pipe,
fitted with tool joints, is, in a sense, an expendable item and as
such contributes substantially to the cost of drilling a well. Both
92
